Progressive blindfold chess training from square recognition to full games
Nine letters. One hidden word.
Stage
Not given
Startup
Founded
Not given
2026
Based in
FR
US
Pricing model
Freemium
Free
Pricing
Free: €0 forever with unlimited exercises, games vs AI, and access to levels 1-3. Pro Lifetime: €39 one-time payment for all 7 levels, all 8 AI difficulties, famous games library, endgame training, and intermediate tactics.
Not given
Key features
7 progressive training levels from square colors to full blindfold games
Unlimited exercises and games against AI
Voice-controlled play in 6 languages
Progress tracking and achievement system
Cross-device synchronization
Famous grandmaster games to replay blindfolded
Endgame training module
Multiple board visibility modes
Tactical puzzles and exercises
New puzzle every day at midnight in local time zone
Build words of four or more letters using center letter
Each tile can be used once per word
Streak tracking by solving the nine-letter word
Archive of past puzzles available to play
Optional daily email subscription
No account or login required
Built for single thumb play
What makes it different
Systematic progression from fundamentals to blindfold mastery, not just a side effect of puzzle training
Free tier is genuinely free with no dark patterns or engagement manipulation
One-time €39 lifetime payment with no subscription required
Built and maintained by a single indie developer actively improving the product
Available across web, iOS, and Android with unified account
Same grid for everyone each day without competitive leaderboards
No ads, no app needed, plays in any web browser
Includes Journal with strategy guides and focus articles
DarkSquares
Ninefold